Austromitra minutenodosa is a species of small sea snail, marine gastropod mollusk in the family Costellariidae, the ribbed miters.

[2] Cernohorsky described Austromitra minutenodosa as follows: Shell minute, up to 4.5 mm in length, elongate-ovate, teleoconch of 4 ½ whorls which are sub-angulate at sutures, protoconch (missing in adult specimens) of 1 ¼ smooth embryonic whorls in juvenile individuals.

Axial ribs number from 13-14 on the penultimate and the body whorl and extremely fine, macroscopic longitudinal striae are visible in some individuals, spiral sculpture absent.

Aperture about equal in height to the spire, smooth within, columella not calloused and with 3 strong, oblique folds, first two posterior folds become thick and rope-like and extend onto the siphonal fasciole towards the dorsal side.

[2]Cernohorsky noted that there were no visually similar species found in either Australia or New Zealand.